package day07;

public class 使用最小花费爬楼梯 {
    /*public int minCostClimbingStairs(int[] cost) {
        // 定义dp
        int n = cost.length;
        int[] dp = new int[n + 1];
        // 利用for循环
        for (int i = 2; i < n + 1; i++) {
            dp[i] = Math.min(dp[i - 1] + cost[i - 1], dp[i - 2] + cost[i - 2]);
        }
        return dp[n];
    }*/
    public int minCostClimbingStairs(int[] cost) {
        int n = cost.length;
        int[] dp = new int[n];
        dp[n - 1] = cost[n - 1];
        dp[n - 2] = cost[n - 2];
        for (int i = n - 3; i >= 0; i--) {
            dp[i] = Math.min(dp[i + 1], dp[i + 2]) + cost[i];
        }
        return Math.min(dp[0], dp[1]);
    }
}
